The correct answer is: A. Voice transmission from base station to mobiles.
FVC (Forward Voice Channel) is a channel used for voice transmission from the base station to the mobile. It is a unidirectional channel, which means that data can only be transmitted from the base station to the mobile.
The other options are incorrect because:
- Option B is the function of the reverse voice channel (RVC).
- Option C is the function of the mobile originating call (MOC).
- Option D is the function of the broadcast control channel (BCCH).